A corpobation oe pennsyl



May 26, 1931.

M. A. PENROD ET AL RAILWAY SIGNALING Filed March 26. 1930 E kw INVENTORS} 6. 1. Brooks,

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Patented May 26, 1931 PATENT oFFIcE MELVIN Airannon, or swIssvALE, HENRY s. YOUNG, or WILKINSBURG, AND CHARLES- A. BROOKS, F sWIssvA E; PENNSYLVANIA; ASSIGNORS TO THE UNION" swrrcna SlTGNAL COMPANY, OF SWISSVAL'E, PENNSYLVANIA, A'CORPORATION OI PENNSYL-.

VANIA RAILWAY SIGNALING Application filed March 26, 1930. SeriatNo. 438,996.

Our invention relates to railway signaling, and has for an ob]ect the provision of means for controlling signals in such manner as to insure safe speed of trains over hazardous 51 stretches of track, such for example, asdown grades.

Wewill describeone form of signaling system embodying our invention, and will then point out the novel, features thereof in claims divided by: the'usualv insulated joints to form.

three track sections A"B,BG, and 0 D. Each section is provided with theusual-track circuit, comprising a track battery 2, and a track relay'designated by the reference characterT with a'suitable distinguishing expon ent. Each sectionsis provided with asignal designated by the reference character S with a suitable distinguishing exponent; As here; shown, each of thesesignals comprises only a stop lamp Band at proceed lamp G, b'utinactual practicelthe signals will usually be provided: with lamps forgiving additional; indications.

Each signal is provided with a home relay} designated by -the reference character-H with thesame'exponent as that applied tothe corresponding signal. Each signal: is controlled by contact 18'of the associated home :relg in is such ma'nner" that the proceed lamp lighted'when the relay is closed ancluthe stop lamp R is lighted when the'relayisfopen. The

circuitsfor these lamps will be: obvious from the drawings without detailed explanation,

and-thecirCuits for signalsls and SP are omitted tosim lify the drawing.

Homerela C is controlled inpart bya V slow-acting evice F, having a first contact 4 which is closed when and only when the de vice "is in its initial condition, and asecond anda third-cOntactlOand 15 which are-closed when and only when the device isin its oper-:

ated condition. Associated with the slow-act- Home relay H is provided with a circuit which passes from terminal X of a suitablesource of current, through the front point of contact 3 of track relay T contact 4 of slowacting device F, front point of contact 5 of track: relay TZ'contact 6 of track relay T and the winding of relay H to terminal 0 of the same source of current. It will be seen that'this circuit can be closed when and only when both track relays T and T? are closed and the slow-acting device F is in its initial condition.

that this circuit can be closed when and only When theslow actingdevice F is in its operated condition and both track relays T and T 'areclosed. V

The slow-acting device F is provided with two operating, circuits. circuits passes from terminal X, through contact12 of track relay T back contact 13 oftrack relay T and the winding of device F to terminalO. This circuit will be closed when a trainenters section A- B provided that track relay T is closed. The second operating circuit for device F is from terminal X, through front contact 7 of track relay T back point of contact 8 of track relay'TP, front contact 17 of relay E, and the winding of device F to terminal 0. This circuit can be "closed. when a train enters section B provided that Y relay E becomes energized. The slow-actingdev'ice F is provided with a stick or holding circuit which includes front Contact? of track relay T back point of contact 8- of track :relay T back contact 14 o'f-relay E, front contact 15 of the-device F,

and the winding of this device: to terminal 'The pick-up circuit for stick relay E is from terminalX, through the back point of contact 5 of track relay T contact 4 of device-F", back point, of contact 3 oftrack relay The first of these:

T and the winding of relay E to terminal O. It will be noted that this circuit will be closed when a train enters section BC, provided that contact 4 is closed, that is, provided that the device F is in its initial condition. The stick circuit for relay E is from terminal X, through front contact 7 of track relay T back point of contact 8 of track relay T contact 16 of relay E, and the winding of this relay to terminal 0.

The operation of the apparatus is as follows: Assuming that all of the parts are in the conditions shown in the drawing, signals S and S will indicate proceed, because the associated home relays H and H are closed, but signal S will indicate stop because home relay H is open.

When a train enters section A-B, it will open track relay T thereby closing the first operating circuit for the slow-acting device F. If this device completes its operation before the train enters section B-C, then when the train does enter this section, the pick-up circuit for relay E will not be closed, because contact 4 will be open, and so relay E will remain deencrgized. The stick or holding circuit for the device F will then be closed at contacts 15, 14-, 8 and 7, so that the device F will be held in its operated condition. Home relay H will then be closed with the result that signal S will give a proceed indication.

If, however, the time consumed by the train in passing through section AB is less than the time required for the operation of the slow-acting device F, then when the train enters section BC, the holding circuit for device F will not be closed because contact 15 of this device will be open. The first operating circuit for device F will be opened, however, at contact 12 of track relay T and so this device will immediately return to its initial condition wherein its contact 4 will be closed. The pick-up circuit for relay E will then become closed, so that relay E will become energized, with the result that the second operating circuit for device F will be closed. The stick circuit for relay E will, of course, be closed as soon as this relay becomes energized, and so relay E will remain closed even after contact 4 of device F opens. If the time consumed by the train in passing through section B-C is greater than the time required for the oper ation of the device F, then the circuit for relay H will be closed before the train reaches signal S with the result that this signal will give a proceed indication by the time the train reaches it. If the time consumed by the train in passing through section BC is less than the time required for the operation of the device F, then signal S will still indicate stop when it is reached by the train.

It will be seen from the foregoing, that we have provided a single slow-acting device F for two sections A-B and BG, which device is so controlled that a train must consume a given interval of time in passing through one or the other of these sections in order to permit signal S to be cleared before the train reaches it. Assuming that track K is on a down grade, it will be seen that We have provided a simple and effective means for insuring that the speed of the train shall be properly controlled while passing over this portion of track.

It will be noted that the circuit for home relay H includes contact 4 of the slow-acting device F, thereby insuring that this device shall be in its initial condition when a train enters section A-B, as otherwise signal S will indicate stop.

Although we have herein shown and described only one form of apparatus embodying our invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of our invention.

Having thus described our invention, what we claim is:

1. In combination threesections of railway track, a track circuit including a track relay for each section, a slow-acting device, a first operating circuit for said device including a back contact of the track relay for the first section and a front contact of the track relay for the second section, a normally open stick relay, a pick-up circuit for said stick relay including a back contact of the track relay for the second section and a contact which is closed only When said slow-acting device is in its initial condition, a stick circuit for said stick relay including aback contact of the track relay for the second section, a stick circuit for said slow-acting device including a contact closed only when the device is in its operated condition and a back contact of said stick relay as Well as a back contact of the track relay for the second section, a second operating circuit for said slow-acting device including a front contact of said stick relay and a back contact of the track relay for the second section, a signal for said third section, and a controlling circuit for said signal including a front contact of the track relay for the third section and a'contact closed only when said slow-acting device is in its operated condition.

2. In combination, three sections ofrailway track, a slow-acting device, means for setting said device into operation when a train enters the first section, a normally open relay, meansfor closing said relay when the train enters the second section if said device has not completed its operation during the passage of the train through the first section but not if the operation of the device is completed When the train enters the second section,

means for holding said device in its operated condition While the train traverses the second section if "said relay is open, means for again setting said device into operation When the train enters the second section if said relay closes, and a signal for said third section controlled by said device. i

i 3. In combination, three sections of rail- Way track,'a slow-acting device having a first contact closed only When the device is in its initial condition and a second contact closed only When the device is in its operated condition means for setting said device into operation when a train enters the first section, a normally open relay, means for closing said relay When the train enters the second section if said first contact is closed but not if it is open, means for holding said device in its operated condition While the train traverses the second section if said relay remains open,

means for again setting said device into Op 7 eration when the train enters the second section if said relay closes, a signal for said third section, and a controlling circuit for said signal including the second contact of said device.

tures. i

MELVIN A. PENROD; HENRY S. YOUNG. CHARLES A. BROOKS.

Intestimony whereof we aflix our signa- V 

